This is definitely an odd one… it has a noise gate and a compressor in a relatively compact single package, which is not a bad thing, but can’t work with a battery, which means that an AC adapter is mandatory. I don’t have a shipping box or manual, so I can’t tell if an adapter was sold with the unit: however any standard 9V adapter should work. The box uses electronic, not mechanical switching, and the physical feedback is simply awful: you can’t tell if you have actually pressed the buttons unless you look at the two LEDs. On a more positive note, there is a couple of send/return jacks on the top. While my unit has a light blue color, I’m sure I’ve seen the very same model in black. There were different units who shared the same box and physical structure, i.e. the R-1X Digital Reverb and the D-1X Digital Delay. The company is now called Vestax, and has an impressive catalog of DJ-oriented products, but no stompboxes as far as I know.